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# SSLSessionContext

`public interface SSLSessionContext`
``

javax.net.ssl.SSLSessionContext

A `SSLSessionContext` represents a set of `SSLSession`s associated with a single entity. For example, it could be associated with a server or client who participates in many sessions concurrently.

Not all environments will contain session contexts.

There are `SSLSessionContext` parameters that affect how sessions are stored:

- Sessions can be set to expire after a specified time limit.
- The number of sessions that can be stored in context can be limited.

A session can be retrieved based on its session id, and all session id's in a `SSLSessionContext` can be listed.

See also:

- `SSLSession`

## Summary

### Public methods
`abstract Enumeration<byte[]>` | `getIds()` Returns an Enumeration of all session id's grouped under this `SSLSessionContext`.
`abstract SSLSession` | `getSession(byte[] sessionId)` Returns the `SSLSession` bound to the specified session id.
`abstract int` | `getSessionCacheSize()` Returns the size of the cache used for storing `SSLSession` objects grouped under this `SSLSessionContext`.
`abstract int` | `getSessionTimeout()` Returns the timeout limit of `SSLSession` objects grouped under this `SSLSessionContext`.
`abstract void` | `setSessionCacheSize(int size)` Sets the size of the cache used for storing `SSLSession` objects grouped under this `SSLSessionContext`.
`abstract void` | `setSessionTimeout(int seconds)` Sets the timeout limit for `SSLSession` objects grouped under this `SSLSessionContext`.

## Public methods

### getIds

    public abstract Enumeration<byte[]> getIds ()

Returns an Enumeration of all session id's grouped under this `SSLSessionContext`.

Returns
`Enumeration<byte[]>` | an enumeration of all the Session id's

### getSession

    public abstract SSLSession getSession (byte[] sessionId)

Returns the `SSLSession` bound to the specified session id.

Parameters
`sessionId` | `byte`: the Session identifier

Returns
`SSLSession` | the `SSLSession` or null if the specified session id does not refer to a valid SSLSession.

Throws
`NullPointerException` | if `sessionId` is null.

### getSessionCacheSize

    public abstract int getSessionCacheSize ()

Returns the size of the cache used for storing `SSLSession` objects grouped under this `SSLSessionContext`.

Returns
`int` | size of the session cache; zero means there is no size limit.

See also:

- `setSessionCacheSize(int)`

### getSessionTimeout

    public abstract int getSessionTimeout ()

Returns the timeout limit of `SSLSession` objects grouped under this `SSLSessionContext`.

If the timeout limit is set to 't' seconds, a session exceeds the timeout limit 't' seconds after its creation time. When the timeout limit is exceeded for a session, the `SSLSession` object is invalidated and future connections cannot resume or rejoin the session. A check for sessions exceeding the timeout limit is made immediately whenever the timeout limit is changed for this `SSLSessionContext`.

Returns
`int` | the session timeout limit in seconds; zero means there is no limit.

See also:

- `setSessionTimeout(int)`

### setSessionCacheSize

    public abstract void setSessionCacheSize (int size)

Sets the size of the cache used for storing `SSLSession` objects grouped under this `SSLSessionContext`.

Parameters
`size` | `int`: the new session cache size limit; zero means there is no limit.

Throws
`IllegalArgumentException` | if the specified size is `< 0`.

See also:

- `getSessionCacheSize()`

### setSessionTimeout

    public abstract void setSessionTimeout (int seconds)

Sets the timeout limit for `SSLSession` objects grouped under this `SSLSessionContext`.

If the timeout limit is set to 't' seconds, a session exceeds the timeout limit 't' seconds after its creation time. When the timeout limit is exceeded for a session, the `SSLSession` object is invalidated and future connections cannot resume or rejoin the session. A check for sessions exceeding the timeout is made immediately whenever the timeout limit is changed for this `SSLSessionContext`.

Parameters
`seconds` | `int`: the new session timeout limit in seconds; zero means there is no limit.

Throws
`IllegalArgumentException` | if the timeout specified is `< 0`.

See also:

- `getSessionTimeout()`

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